Machine for operating rock-drills



(Nb Model.)

H. HUSTON & E. J. MARTIN.

MACHINE FOR OPERATING BOOK DRILLS.

No. 396,745. Patented Jan. 29, 1889.

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HARRISON HUSTON AND ELIVIN .I. MARTIN, OF IDAHO SPRINGS, COLORADO.

MACHINE FOR OPERATING ROCK-DRILLS.

SPECIFICATION forming part of Letters Patent No. 396,745,, dated January 29, 1889.

Application filed June 9, 1888. Serial No. 276,634. (No model.)

To all whom it may concern/.-

Be it known that we, HARRISON I'IUSTON and ELWIN J. MARTIN, citizens of the United States of America, residing at Idaho Springs, in the county of Clear Creek and State of Colorado, have invented certain new and useful Improvements in li'lechanism for Opel-at ing Rock-Drills, of which the following is a specification, reference being had therein to the accompanying drawings.

Our invention relates to a new and improved construction of mechanism for operating rotary drills, and its object is to furnish a mechanism for rotating such drills and for feeding them forward in the material being acted on during rotation, which shall be simple and economical in construction, reliable and comparatively speedy in operation, with a high degree of efficiency for the amount of power applied thereto, easily managed and operated, and durable in use; to which ends it consists in the features more particularly hereinafter described and claimed.

In the drawings illustrated a drill-operating mechanism embodying our invention, in which Figure 1 is a top or plan view thcrmf; Fig. 2, a section on line .1" .r, Fig. 1; Fig. 2 a side view; Fig. 4., atop view of the turn-table; Fig. 5, a section of the base and the turn-table on line 3 y, Fig. 1; Fig. (i, a section of a detail of construction.

In the figures, the refereiice-numeral1 indicates what may be termed the fixed base of the operative n1ocl1anism,in that, while capable of rotation and adjustment to vary the angle at which the drill may be worked, it is fixed or stationary relatively to the devices for rotating and feeding the drill, as hereinafter described. This base 1 rests upon what may be termed the turn-table at, pivoting thereon, so as to be capable of rotation by a pivot-pin, 2. From the under side of the base 1 lugs or bolts 3 depend, taking in and pass ing through slots 5 in the turn-table t, and having clamp ing-nuts 26 upon their outer end, so that the base 1 and turn-table 4: may be secured or clamped together at any desired relative position permitted by the length of the slots 5. Upon the underside of the turntable 4 is a clamp, 6, of the usual construe ti'on, by which the turn-table may be secured rigidly to an ordinary extension-post or any other suitable base to support the drill and drill mechanism in the proper position.

Upon the base 1. are formed suitable guides or ways for the rotating and feeding mechanism to move or reciprocate in, such ways being here shown as the grooved guideways 7.

8 8 are the longitudinal bed-pieces supporting the drill mechanism proper, and formed to engage with, move upon, and be guided by the grooved guidewa'ys 7. To them are secured the cross-braces or bed-pieces 9 9 9, forming with S 8 a rigid iirm bed or frame for the operative parts and affording suitable bearings therefor. The bed or frame maybe further secured and braced by longitudidal pieces 10 10. The exact construction of such bed, however, is not a material part of the invention, so long as its construction be such that it may be readily reciprocated and guided upon the base 1 and afford the suit able hearings or locations for suitable bearings for the parts to be placed thereupon. Suitably j ournaled in bearings in or upon the frame or bed is the main shaft 11, to which is attached the main gear-wheel 12, furnished with a crank-handle, 13, for manual operation. The gear 12 meshes with a gear, 14-, on the drill-spindle 15, suitably j ournaled in or on the movable bed or frame near its forward end, or at more than one point, if desired. At its rear end, however, this drill-spindle 15, which is hollow, should be journaled either within or upon the exterior of a hollow or tubular fixed bearing, 16, which is supported by a bracket, 17.

As here shown, the rear end of drill-spindle 15 is journaled within the fixed tubular bearing 16, and the latter should be so fashioned that a tube or hose from any convenient water tank or supply may be attached thereto, in order that water may pass into and through the hollow drillspindle to aid in the cutting and to wash the debris from the hole.

The gears 12 and let should be calculated relatively to each other to give a high rate of speed to the drill, to which end they may connect directly, one being of several, even many times the teeth of the other, or they may connect through intermediate gearing.

Provision now being made for the rotation of the drill, there must also be means provided for feeding it forward, which means are arranged as follows: Upon the main shaft is second and smaller gear, 18, meshing with a gear, 19, on a feed-shaft, 20, suitably journaled in bearings in or upon the bed orframe. Upon or near the outer or front end of this shaft 20 is secured a worm-gear, 21, which meshes with a rack, 22, on the fixed base 1. Then as power is applied to the main shaft 11 and gear 12 to rotate the drill motion is also communicated through gears 18 and 19 to the worm 21, which, taking in the rack 22, causes the drill mecl'ianism and its frame or bed to advance or move upon the fixed base 1. To enable a retrograde movement to be given quickly, more expeditiously than possible with a reverse movement of the drilling mechanism, the rack 22 is not rigidly secured to the base 1, but pivotally, as at 27, a stop, 24, being arranged upon the base 1 to hold the otherwise free end of the rack from move ment in one direction, while a pivoted button or catch, 23, holds it securely when in. locking position, as in full lines in Fi 1, from movement in the other direction. The button an d the rack being turned, as in dotted lines in Fig. 1, the worm and the rack are disengaged and the sliding bed-pieces 8 8 and parts secured thereupon may be rapidly slid back in the grooved ways 7 7 \Vith fixed gears 18 19 and fixed worm 21 and rack 22 the rate of feed or forward movement of the drill would be fixed and constant relatively to its speed of rotation. As, however, the rate of cutting by the drill depends upon the hardness and refractoriness of the material operated on, a constant speed being maintained, the feeding devices shouldbe capable of variation, so as to feed more rapidly in soft rock, &c.,and more slowly in the harder. The rate of feed could be varied by changing the gears 18 19 so as to give more or less revolutions of the worm 21 to a given number of revolutions of the drill-spindle. \Ve prefer, however, to use fixed gears 18 19 and vary the rate of feed by changing the worm and its 00- acting rack. For this purpose several wormgears may be provided varying in pitch, they being constructed so as to be removably secured upon or to shaft 20. Such removable attachment may be accomplished by having the worms made upon the exterior of cylinders which are internally screw-tln'eaded, as shown at 28, such screw-thread taking in a corresponding thread on the end of shaft 20; or a worm maybe rigidly secured to apart of the shaft 20,which in such case is divided, the two parts being united by a mortise and tenon, as shown at 25 in dotted lines, or by the end of one part taking in a suitable socket in the other part. In either of these ways the worm may be readily and quickly changed to vary the feed to the quality of rock or material being operated on. At the same time the rack 22 maybe changed, one being removed by simply unscrewing or unbolting at the one point 27, and another corresponding to and adapted to mesh with the worm to be used being substituted and secured in position by one screw or bolt at the same point.

As illustrated, this drill mechanism is shown to be'operated by hand-power applied to the crank. It, however, is equally applicable to a power-drill, for any suitable motorsteam, compressed air, electric, &c.maybe mounted upon or secured to either the drill-spindle or the main spindle, or shaft 11, so as to communicate motion both to the drill and the feeding mechanism.

In practice the operation is as follows: The turn-table 4, by means of the clamp 63, is secured at the proper angle or in suitable position upon an extension-post or other support, the fixed base 1 being turned thereon to the desired point and there clamped by means of the nuts 26. The proper pitched worm and spaced rack for the rate of feed suitable for the rock to be operated on should be secured I in their proper places. Power, either hand, by the crank 13, or by an engine located as indicated, being now applied, the drill will be rotated and fed forward, so as to accomplish its work in a reliable manner and effectively.

Having thus described our invention,what we claim is 1. The combination of a fixed base provided with guideways, a bed or frame upon such base and moving in the guideways, a drillspindle mounted in or on such bed or frame, mechanism, as described, for rotating the drill-spimlle, and a feed mechanism consisting of an interchangeable and removable worm-gear on the moving bed or frame, and a removable and interchangeable rack adapted to mesh therewith and secured upon the fixed base, substantially as set forth.

2. The combination of a fixed base provided with guideways, a bed or frame adapted to move in such guideways, a drill-spindle mounted in or on such frame or bed, mechanism, as described, for rotating the drill-spindle, and a feed mechanism consisting of a worm-gear 011 the moving bed or frame, and a pivoted rack on the fixed base, and stops upon such base for holding the rack in operatiy e position, substantially as set forth.

8. The combination of the base 1, having grooved guideways and the depending lugs or bolts 3, the bed or frame adapted to move in such guideways, a drill-spindle mounted in or on such bed or frame, mechanism, as described, for rotating the drill-spindle, a feed mechanism consisting of a worm-gear on the moving bed or frame, a rack pivoted on the IIO 'base i and meshing with the Worm-gear, and In testimony whereof we avffix our signastops for holding the rack in operative positures in presence of two Witnesses.

tion, the turntable 4,]1aving the curved slots HARRISON HUSTON.

5, through which take the bolts 01 lugs 3, ELYVIN J. MARTIN. 5 having the nntted heads 26, and the pivotal \Vitnesses:

connection 2 between the base 1 and turn- Z. F; \VILBER.

table 4:, substantially as set forth. JNO. XV. KNOX. 

